Sega CD MODEL 1 repair?

I have a sega cd model 1.

It won't power on, at first I thought it was a fuse issue so I replaced the F1 fuse with a fuse holder and a 1.5amp tube fuse. Still nothing, so I was messing around with the disc tray. I gently moved the laser to the back of the disc tray, then tried to power on the system. It wouldn't power on but the laser was moving back to the original position then it'd stop so I know the fuse is good and power is working it's just not reaching far enough.



The front LEDs do not power on.



I've checked all the caps and they all look clean.

 

Silly things out of the way first....

You've connected a console of the right region, have it hooked up correctly and hit reset to check it ejects... right? And checked the PSU is outputting the right voltage, even under load?

 

Both my consoles are NTSC consoles, (I would assume since it says Sega CD and not Mega CD, same with my Model 1 Sega Genesis) and even then both consoles match up to the region. I have it hooked up correctly I would assume since the attachment attaches just like a Sega Cartridge and I apply just enough pressure to assure it's on (I've even cleaned the contacts).

Those aside, I can't even hit reset to check if it ejects because the console doesn't even power on. If I put a cartridge in the Sega Genesis, it plays the cartridge. When I have no cartridge and no cd, nothing plays It just goes to a black screen. The lights of the Sega CD don't turn on (Ready and Access). The only time I get any activity is when I move the laser mechanism to the back (then when I turn on the Genesis it moves towards the front again) and that's all I get out of it.

 

Probably broken solder joints on the main asic, I've seen it several times before.

 

Replace the caps anyway. I own two MCD1s and while the caps on the power board looked fine, the system would not power on.

In case of both my systems the caps on the main board were starting to leak pretty bad. You should replace them all while you're at it

 

tr1 or look under power board.

 

if you plug a console of incorrect region into mega cd should still get the blue screen with the not designed for use in this region lockout

could be a bad bios chip if its the plug in type they have been known to go bad

i'd also try re-seating the ribbon connectors, but 90% of the time its usually bad capacitors.

 

It may be the Darlington Transistor TR4, it turns the console on when the Genesis is connected. Also, if the teeth in the cartridge slot are touching, the Sega CD will not boot up.